[type]: sewing machine [type]: roller foot [material]: Steel Suitable for thick material To tacky material in sewing more smoothly, reduce the friction, needle feed carwrinkle free car types and need to drag the auxiliary device. Than Teflon) or plastic pressure foot durable over 800 times. The roller presser foot only could make a curvature of the fabric, the presser foot can effectively improve thesewing cloth smoothness, improves the working efficiency by 5-10 times than the ordinary pressure foot. Quality must be first-class. Some well-knownmanufacturers are using our products to complete. Please rest assured to buy oh.